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Marginal cost is calculated by dividing the change in total cost by the change in quantity, representing the additional cost per unit.
A boat can row to a place of 60km away and come back in
A boat can cover 120 km in downstream in 12 hours and 100 km in upstream in 10 hours. Find the distance travelled by the boat in still water in 5 hours.
A boat goes 52 km in upstream in 4 hours and takes 3 hours to complete a distance of 15 km in downstream. Find the speed of boat in still water.